we had code:
src_t *sp;
dest_t *dp;and we want implement the operation *dp = (dest_t) *sp;.
Assume that the value of sp and dp are stored in register %rdi and %rsi, respectively.
| src_t | dest_t | instruction |
|---|---|---|
| long | long | movq (%rdi), %rax, movq %rax, (%rsi) |
| char | int | movsbl (%rdi), %eax, movl %eax, (%rsi) |
| char | unsigned | movsbl (%rdi), %eax, movl %eax, (%rsi) |
| unsigned char | long | movzbl (%di), %eax, movq %rax, (%rsi) |
| int | char | movl (%rdi), %eax, movb %al, (%rsi) |
| unsigned | unsigned char | movl (%rdi), %eax, movb %al, (%rsi) |
| char | short | mosbw (%rdi), %ax, movw %ax, (%rsi) |